METHOD AND DEVICE FOR LOWERING AND CEMENTING CASING STRINGS Russian patent published in 2022 - IPC E21B33/04 E21B33/14 

FIELD: construction; drilling of soil or rocks.

SUBSTANCE: group of inventions relates to the field of construction and soil drilling, namely to methods and devices intended for lowering and installation of casing strings in wells. Method of lowering and cementing of casing strings includes preparation of well, lowering of casing string into it, removal of drilling mud from annular space and pumping of grouting solution into tubular cavity and its subsequent pushing into annular space of well. At the end of lowering into the well of the casing string, cementing of the casing string is started without disconnection from the lowering tool with a power drive. At the stages of drilling mud removal from annular space, filling of the well shaft with grouting solution with its subsequent forcing into annular space and at the stage of grouting solution setting, the casing string is subjected to reciprocation and rotation.

EFFECT: higher quality of casing cementing and longevity of well casing.

4 cl, 1 dwg